“磨拉石建造”和“不整合”在地层对比中的意义：以扬子地块及其北缘…  

THE SIGNIFICANCE OF MOLASSE FORMATION AND UNCONFORMITY IN THE STRATIGRAPHIC DIVISION AND CORRELATION——EVIDENCE FROM THE LATE PRECAMBRIAN STRATA OF THE YANGTZE PLATE AND ITS NORTHERN MARGIN

作　　者：周鼎武 董云鹏 

机构地区：西北大学地质系

出　　处：《地质论评》1996年第5期416-423,共8页Geological Review

基　　金：国家自然科学基金(编号:491172129)

摘　　要：扬子地块及其北缘晚前寒武纪地层划分对比争议较大，主要是对“地层不整合”和“磨拉石建造”存在认识上的分岐，笔者据现代构造理论，对地壳变形和沉积建造的控制作用认为，地导整合可以发育在被动大陆边缘形成初始阶段的裂谷期和裂谷期后，又可产生造山作用过程；磨拉石建造应按构造动力学背景划分为拉张型，挤压型和剪切型三类；它们分别代表了威尔逊旋回不同阶段的产物。The Long-standing disputes over the stratigraphic division and correlation of the Late Pre-cambrian of the Yangtze plate and its northern margin mainly lie in the divergent understandings of the 'unconformity' and 'molasse formation'. Analysis of the tectonic control on the crustal deformation and sedimentary formation based on modern tectonic theories indicates that the unconformity may develop not only in the rifting and post-rifting period of the initial stage of the formation of passive continental margins, but also in the process of orogeny and also that on the basis of the tectonic dynamic regimes the molasse formation may be divided into three types, i. e. extensional, compressional and shear types, which represent the products of different stages of the Wilson Cycle respectively.

关 键 词：磨拉石 地层不整合 地层对比 扬子地块 寒武纪 

分 类 号：P534.41[天文地球—古生物学与地层学]